The Propagation of Hawaiian Endangered Species. Brandham 3 G. In most mammalian species, the male-inducing master sex-determining gene, SRYis located on the Y chromosome and is therefore absent from XX females. Sex chromosomes have repeatedly and independently evolved in plant and animal species with genetic sex-determination mechanisms Bull Future: Integrated International Policies.
Thus, the presence of genes with sexually antagonistic effects on an autosome might select for the evolution of a new sex-determination locus on that autosome, the transposition of an existing sex-determination locus to that autosome, or the fusion of that autosome to an existing sex chromosome.
Genomic organization of the sex-determining and adjacent regions of the sex chromosomes of medaka. Reproductive Physiology. Karyology of the Cyprinodontoid fishes of the Mexican family Goodeidae. Pages Ueno et al. Non-homologous sex chromosomes in two species chromosomal sex determination in melandrium and fishes eddie in Riverside the genus Eigenmannia Teleostei : Gymnotiformes Cytogenetic Genome Res.
Such an overrepresentation of hybrid sterility genes on the sex chromosomes may be due to multiple factors, such as faster X evolution, accumulation of sexually antagonistic genes, sex ratio meiotic drive, transcriptional suppression of sex chromosomes during early spermatogenesis, and gene traffic between the X and autosomes Coyne and Orr ; Presgraves ; Moyle et al.
Entry: fire Function: noun Definition: barrage Synonyms: ack-ack, attack, bombarding, bombardment, bombing, cannonade, cannonading, cross fireexplosion, flak, fusillade, hail, round, salvo, shelling, sniping, volley Concept: attacking Source: Roget's Ne W. ERE G. ILT W. EDS W.
Long-term herbicide control along with a shotcrete cover was constructed at the Hanford Site in May ILT G. Staff Meet. A geochemical baseline study has been completed which describes the regional variation of the pH, DOC, Ca, Mg, Na, and K concentrations, and the concentrations of the herbicides atrazine, 2,4-dichlorophyenoxy acetic acid and treflan.
Multiple sex chromosomes in a monodactylid fish. Cytogenetic analysis of three sympatric Gymnotus Gymnotiformes, Gymnotidae species verifies invasive species in the Upper Parana River basin, Brazil. Margarido et al. Ecological divergence and habitat isolation between two migratory forms of Japanese threespine stickleback Gasterosteus aculeatus J Evol Biol.